Calculate where text starts on centre alignment

Question

I have a UILabel that I want to add a UIView exactly where the text starts.

The problem is that the text in the label is aligned to the centre so I don't know how to determinate where the actual text starts and where to position this UIView.

Any idea how can I calculate this thing?

Thank you!

You really need to calculate it? Why not use autolayout for that - center label to parent view, and set same with for your UIView. The label should have the exact size for your text. — derdida, Aug 16 '16 at 10:19
@derdida The view is 1px width and 5px height, I want it to be exactly where the text starts. That's why I need to calculate it — FS.O5, Aug 16 '16 at 10:39
and why not set to the left end of the textview? otherwise you could use "sizeToFit()" with your label, and get the size (label.frame.size.width) — derdida, Aug 16 '16 at 10:41

Marco Santarossa · Answer 1 · 2016-08-16T11:38:26.633

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You can use a UIView container which will wrap the UILabel and your new UIView. Then you can let the UILabel decides the width depending on its content and set it in the center of the container. Once you have this working you can just read the UILabel x to understand where it starts.

so the UILabel will have the constraints to top, bottom, the height you want and at center to horizontal whereas the little UIView to top, bottom, height, width and leading equal to UILabel

edited Aug 16 '16 at 11:38

answered Aug 16 '16 at 10:44

Marco Santarossa

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I don't really understand, can you please edit your answer with a quick example to help me understand better? – FS.O5 Aug 16 '16 at 10:45
This is a description how solve that with autolayout. – derdida Aug 16 '16 at 11:23

score 1 · Answer 2 · edited May 23 '17 at 12:33

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From :How to find the position(x,y) of a letter in UILabel

NSRange range = [@"Good,Morning" rangeOfString:@","];
NSString *prefix = [@"Good,Morning" substringToIndex:range.location];
CGSize size = [prefix sizeWithFont:[UIFont systemFontOfSize:18]];
CGPoint p = CGPointMake(size.width, 0);
NSLog(@"p.x: %f",p.x);
NSLog(@"p.y: %f",p.y);

you can modify it for your purpose

edited May 23 '17 at 12:33

Community

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answered Aug 16 '16 at 11:51

Prashant Tukadiya

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score 1 · Answer 3 · answered Aug 16 '16 at 11:51

you can get text size using "nsattributedstring"

let label = UILabel(frame: CGRectMake(0, 0, 100, 100))
label.text = "dshfk,j"
label.textAlignment = .Center
label.textColor = UIColor.redColor()

let string = label.attributedText
let width = string!.size().width
let height = string!.size().height

let view = UIView(frame: CGRectMake(width, height, width, height))
view.backgroundColor = UIColor.blackColor()

then you can find rect using this ..

sample view

score 0 · Accepted Answer · answered Aug 16 '16 at 20:59

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You could also use

yourLabel.sizeToFit()

to automatically resize your label for the space it needs. And then read out the frame of your label with:

yourLabel.frame.size (width or height)

answered Aug 16 '16 at 20:59

derdida

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Calculate where text starts on centre alignment

4 Answers4